I shoot 30 grain VMAX rounds at 2250 feet per second in my Mossberg chuckster. I know they make 40 grain rounds that are easily obtainable. I've heard they make 50 grain rounds that run around 1,600 ft per second but I've never seen them for sale. Does anybody know where to get them? And what are the results when shooting game like rabbits with the 50 grain versus the 30 grainers? Do they penetrate more?